Ablation of PTPRJ zebrafish ortholog, ptprja, results in thrombocyte reductions. (A) Representative images of larvae at 4 dpf for each condition expressing transgenic cd41:GFP. Scale bar, 100 µm. (B) Number of thrombocytes counted at a consistent location on lateral images of the body [red rectangle in (A)], for each condition: uninjected controls and 50 pg G4, with or without 200 pg Cas9. ****P < .0001, 2-tailed Student t test.